Larry,
I picked up an old beatup LeFever Single barrel trap gun a few years ago. The trap range I shot at required steel shot, I had the gun rquipped with thin wall choke tubes so I could use modified at the trap range that required steel shot and Full at all the other ranges. One night the modified choke tube came loose while shooting steel shot causing a huge ring bulge and it also blew the choke tube right out of the barrel.
Steve

Approach life like you do a yellow light - RUN IT! (Gail T.)